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747-400
MAINTENANCE MANUAL

 (2)  Scavenge oil from No. 1, 2 and 3 bearings is gravity drained to the accessory gearbox. A scavenge pump returns oil from the No. 4 bearing area to the accessory gearbox. All the oil which is drained into the accessory gearbox collects in an oil sump located at the bottom to the gearbox housing. The accessory gearbox scavenge pump returns the oil through the external scavenge oil tube to the oil tank. A chip detector installed at the bottom of the gearbox housing collects ferrous metal particles in the oil. Also, a screen upstream of the scavenge pump prevents foreign matter from entering the oil tank.
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747-400 FAULT ISOLATION/MAINT MANUAL
APU ENGINE LUBRICATION SYSTEM
COMPONENT  102 SHT FIG.  QTY  ACCESS/AREA  AMM REFERENCE 
DETECTOR - ACCESSORY GEARBOX CHIP  2  1  317AL, 318AR/310 (APU COMPARTMENT)  49-27-04 
DETECTOR - LOAD GEARBOX CHIP  2  1  317AL, 318AR/310 (APU COMPARTMENT)  49-27-04 
ELEMENT - OIL FILTER  2  1  317AL, 318AR/310 (APU COMPARTMENT)  49-27-03 
PUMP - OIL  2  1  317AL, 318AR/310 (APU COMPARTMENT)  49-27-07 
SEAL - AC GENERATOR DRIVE OIL  1  2  317AL, 318AR/310 (APU COMPARTMENT)  49-27-05 
CARBON SEAL - ACCESSORY GEARBOX BREATHER ADAPTER  3  1  317AL, 318AR/310 (APU COMPARTMENT)  49-27-01 
SEAL - ACCESSORY GEARBOX MAIN SHAFT OIL  2  1  317AL, 318AR/310 (APU COMPARTMENT)  49-27-02 
SEAL - FUEL PUMP DRIVE SPUR GEARSHAFT OIL  3  1  317AL, 318AR/310 (APU COMPARTMENT)  49-27-06 

APU Engine Lubrication System - Component Index
Figure 101

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747-400
FAULT ISOLATION/MAINT MANUAL

SEE A
SEE G
FWD
APU COMPARTMENT
SEE F SEE B
DRIVE OIL
SEAL FOR THE
AC GENERATOR
(2 LOCATIONS)
SEE E
B

GENERATOR
DRIVE PAD
GENERATOR
DRIVE SHAFT

FWD
(TWO AC GENERATORS REMOVED) A
SEE C
SEE D
FWD
APU Engine Lubrication System - Component Location
Figure 102 (Sheet 1)

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A

747-400 FAULT ISOLATION/MAINT MANUAL
STARTER MOTOR
CHIP DETECTOR GEARBOX LOAD  FWD 
C 
ELEMENT OIL FILTER 
PUMP OIL  ADAPTER GEARBOX ACCESSORY 
DETECTOR CHIP GEARBOX ACCESSORY  MAINSHAFT OIL SEAL  D FWD (STARTER MOTOR REMOVED) GEARBOX ACCESSORY 
STARTER MOTOR 
E  FWD 
Figure 102 (Sheet 2) APU Engine Lubrication System - Component Location 

L73029
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